Wissmach Black/ Oyster Pearl (color code 96-36) is a Prisma blend in COE 96 kiln glass, bold black and warm pearl streaks in a 3mm sheet, tested for fusing compatibility.
Appearance The area photographed shows the blend at its pearl end, a warm ivory with soft caramel bands drifting across it in gentle horizontal waves. Black is first in the name and the more dominant across the blend, sweeping through as bold dark trails against that creamy ground. The streaking is unique to each sheet, so no two are identical.
Striking As a Prisma blend it may strike in the kiln, with Wissmach noting its Opaque and Prisma colors can fire deeper or denser. Expect a slightly richer result than the raw sheet, and sample a chip first when it matters.
Working notes Wissmach’s recommended full fuse schedule for a 6mm project made from two 3mm layers: heat at 300 degrees F per hour to 1225 F and hold 30 minutes, then 600 per hour to 1460 F with a 10 minute hold, cool as fast as the kiln allows to 960 F and hold 1 hour, then 100 per hour down to 700 F. These numbers come from Wissmach’s current published firing guidance. They are guidelines, not guarantees. Kilns differ, so fire a small test piece first.
Reactions Oyster Pearl brings sulfur to this blend on Wissmach's COE 96 chart. Fired in direct contact with a copper bearing color such as Reactive Blue, Deep Sky Blue, Turquoise Green or Sea Blue, it can form a darker copper sulfide line where the glasses meet. Test the pairing first if the effect matters to your design.
Format and sizes Sold as a 3mm sheet in 8" x 10.5", 10.5" x 16" and 16" x 21" sizes. Choose your size from the options on this page.
Fusing and compatibility Tested compatible with other Wissmach COE 96 kiln glass. With glass from other makers, a matching COE number alone does not guarantee compatibility, so fire a test tile before committing a project.
More of this color Also available with a Luminescent coating .
Helpful downloads Wissmach COE 96 Kiln Glass Catalog
Technical data courtesy of the Paul Wissmach Glass Co.
Description updated: August 13, 2026
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